The error list in QuickBooks says an invoice that was successfully calculated had an error.
The invoice was successfully calculated at least once. However, if it had an error before (or after) that, it could have been added to the error list. To ensure there is no issue:
- Open the invoice again.
- Make a tiny change, and save, to recalculate.
- If there is still an issue, you will see an error. Otherwise it will calculate normally, and you can use the remove button on the error list to remove that entry.